CONVERGE最新技术发展及展望

FutureDevelopmentofCONVERGE:ARoadmaptoIncreasingthePredictiveCapabilityofEngineSimulationsDanielLee,Ph.D.ConvergentScience,Inc.IDAJCAESolutionConference2013CONVERGEConferenceDayNovember7th,2013Yokohama,JapanGasolineCombustionModelingofDirectandPort-FuelInjectedEnginesusingaReducedChemicalMechanismComparisonofinitialflamedevelopmentfromtwodifferentsparklocationCourtesyPrometheusAppliedTechnologyOverviewofPresentation•CompanyOverview•TechnologyOverview•CombustionModeling•Spray/nozzlemodeling•Emissionsmodeling•ConjugateheattransferGasolineHCCIDieselNaturalGas•Foundedin1997,headquarteredinsuburbsofMadison,Wisconsin•ExpertsinCFDflow,spray,combustion•DevelopedCONVERGECFDwhichiswidelyusedintheautomotiveindustry•Rapidlygrowingandstableorganizationwithmanysatisfiedcustomers•CSIcurrentlyhas40employeesandmaintainsdistributorsthroughouttheworld•Recentlypurchaseda~40,000squarefootofficeandwillberelocatinginearly2014•Maintainsastrongacademicprogramwithaninstalledbaseofover50universities•Maintainstrategicpartnershipswiththoughtleadersfortechnologyimprovement.•LawrenceLivermore,Argonne,Sandia,OakRidge,SandiaetcConvergentScienceInc.(CSI):SummaryCurrentConvergentScienceInc.headquartersinWisconsinUSAFutureConvergentScienceInc.headquartersinWisconsinUSA40CurrentCONVERGECFDSoftwareSpraycombustorsimulatedwithLESanddetailedchemistry.Allmeshing100%automatedIgnitionandCombustionSimulationsofSpray-GuidedSIDIEngineusingArrheniusCombustionwithSpark-EnergyDepositionModelSAEtechnicalpaper2012-01-0147CouresyGeneralMotors•CONVERGECFDsoftwarewasdevelopedwiththegoalofincreasingbothproductivityandaccuracyformodelingflow,sprayandcombustion:•Generatesahighqualitymeshautomaticallyatruntimethuseliminatingallusermeshing•Addsmeshrefinementbasedupongradientsusingadaptivemeshrefinement(AMR)•Extensiveparallelprocessingtechnologiesforhighperformancecomputing•Richsuiteofphysicalmodelsforspray,combustionandturbulence•Lagrangianmodelsincludespraybreakup,collision,coalescenceandwallfilm•SAGEdetailedchemistrysolver•ExtensivesuiteofRANSandLESmodels•Stateoftheartsuiteofemissionsmodels•CONGOgeneticalgorithmincludedwhichautomaticallyspawnsCONVERGEsimulationsforoptimizationCONVERGEPhilosophy•100%eliminateallusermeshingtime•Addmoremeshresolutioninkeyareas(Adaptivemeshrefinement&embedding)•Detailedchemistrywithlargemechanisms•Stateoftheartspraymodels•Stateoftheartturbulencemodels(LES)•Highperformancecomputing•Optimization(letthecomputerdotheworkwheneverpossible)•RunmorecyclesandmorecylinderswheneverpossibleVOFmodelingtestcasewithmovingcomponentsCONVERGEStudio•Fullcasesetup(mesh,spray,combustionetc)witherrorchecking•Plottingutility•Chemistryreductionenvironment•DesignedforquickandeasycasesetupEnsightDesktopforCONVERGEEnsightDesktopforCONVERGEnowcomesbundledasastandardfeatureofCONVERGE.Iftheuserprefers,otherpostprocessorscandefinitelybeusedaswell.SealingFeature•InolderversionsofCONVERGE,movingcomponentscouldn’ttouch•Inv2.1,asealingfeaturewasintroducedwhicheliminatesthisrestriction•Thesealingfeatureautomaticallyre-triangulatesthesurfaceduringthesimulationallowingsurfacestocomeintocontact(i.e.,“sealing”)•Thisfeatureisveryusefulfortwostrokeenginetransferportsaswellasrotaryengines•SealingcapabilitycanbesetupinCONVERGE-Studio“sealing”tabTwostroke(above)androtaryengine(left)simulationsutilizingsealingfeatureFluidStructureInteraction9•WithCONVERGE,movingbodyproblemsareeasytosetup–Movingboundariesaren’taproblemasnewmeshisautomaticallygeneratedeverytimestepso•Themotionofmovingbodiesisoftenspecified(valvesandpistons)•Asixdegreeoffreedom(6-DOF)solverhasbeenimplementedforfluidstructureinteraction–Thepressureandviscousforcesareintegratedtousedtodeterminethemotionofmovingcomponents•The6-DOFsolverhasmanyapplicationsincludingvalvesandcompressorsFluidstructureinteractioninCONVERGERepresentativecompressorgeometryfrom“ASimplifiedComputationalFluidDynamicsModelfortheSuctionProcessofReciprocatingCompressors”CollaborationwithCaterpillarInc.andArgonneNationalLaboratory*Sometal.SAE2013HighPerformanceComputing•CONVERGEiswidelyusedinHPC•SAGEparallelizesindependentlyfromtheflow•Dynamicloadbalancingisavailable•METISisnowavailablewhichimprovesloadbalancing•LoadbalancingimproveswithmorecellsandmorechemistrySignificantimprovementinload-balancingusingMETISConvergentScienceintheNewsCONVERGEandCONGOusedbyAchatesPowertodesignatwostrokeopposedpistonDieselengineConvergentScienceintheNewsCONVERGEusedforalternativefuelresearchConvergentScienceintheNewsCONVERGEusedforemissionsmodelingASMEFallTechnicalConference•AttheASME2013ICEngineConference(October2013),therewere13technicalpaperspresentedwhichutilizedCONVERGECFDSoftware•Authorsinclude:CameronCompressionSystems,ArgonneNationalLab,Caterpillar,SandiaNationalLab,ChryslerGroupLLC,GeneralMotors,UniversityofPerugiaItaly,MississippiStateUniversity,CarnegieMelonUniversity,Cummins•Topicscoveredawiderangeincluding:Largeborenaturalgascombustionmodeling,nozzleflowandcavitation,bio-dieselchemicalkinetics,Dieselcombustion,Dieselmicr